Assult Rifle.
Commonly used to refer to the Armalite AR-15, which was later developed into the M-16. Chambered in .223 caliber, the rifle proves to be effective though somewhat ineffective. Today, a variety of manufacturers produce ARs in a variety of calibers.

Anti Roleplayer(s):
These players will deliberately go out of their way to ruin your immersion and experience, in game and out.

They do so by forum trolling signified roleplay posts, spamming /say and emotes (oh god /dance) during a roleplay session or other annoyances that distract from your roleplaying experience (Spamming various spells, and giving no ic (in character) responses when eyebrows are raised at their naked dancing).

Basically, the AR is the kid knocking over sand castles at the beach; they can't be bothered putting effort into building something up, so they'll feel better if they destroy someone else's work.

2. AR: LOL NO JUSTICE 4 RPER!
RPer: You know, just because you don't have the guts to put yourself out there and play the game how it's supposed to be played you don't have to ruin the fun for everyone else.